<button
  class="kuiTableHeaderCellButton"
  ng-class="{'kuiTableHeaderCellButton-isSorted': sortableColumn.isSorted()}"
  ng-click="sortableColumn.toggle()"
  aria-label="{{sortableColumn.getAriaLabel()}}"
>
  <span class="kuiTableHeaderCell__liner">
    <span ng-transclude></span>
    <span
    class="kuiTableSortIcon kuiIcon"
    ng-class="sortableColumn.isSortedAscending() ? 'fa-long-arrow-up' : 'fa-long-arrow-down'"
    ></span>
  </span>
</button>
